Angular Dependence of Photoemission and Atomic Orbitals in the Layer Compound1T−TaSe2

The intensity of photoemission from the Ta-derived $d$ states in the layer compound $1T-\mathrm{Ta}{\mathrm{Se}}_2$ has been measured as a function of angle at the photon energy 10.2 eV. The dependence of the $d$ emission on azimuthal angle displays three pairs of major lobes and indications of three pairs of minor lobes. If it is assumed that these photoelectrons are created on Ta atoms, they propagate preferentially along directions which avoid neighboring Se atoms. The relationship with atomic orbitals and with band theory is discussed.